JP2006112076A - Retractable water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely, positively and stably make lifting operation of hydrants (fire hydrants) retractable from the ground surface when necessary. <P>SOLUTION: In this retractable water supply device 10, the hydrants 30 are disposed at waterline piping P buried underground, extensibly by a double pipe 20 so as to be retractable from the ground, and a resisting means 50 to which resistance not to be elongated by water pressure from the waterline piping P is imparted, is provided between pipes of the double pipe 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an in / out type water supply device, and more particularly, to an in / out type water supply device that is usually connected in a connected state to a water pipe buried underground, and that can make a water faucet in / out with respect to the ground when necessary. .

In recent years, in response to disasters caused by large-scale earthquakes and fires, disaster prevention measures for each local government have been strengthened. When a disaster occurs, the supply of water, electricity, gas, communications, etc. may be interrupted due to the collapse of buildings, roads, etc., and such a suspension of the lifeline function will cause a major hindrance to citizens' lives It is.
Therefore, in each local government, in order to secure a water supply system in the event of a disaster, for example, fire hydrants are installed around elementary schools in each region that are used as evacuation centers for disaster victims and used as emergency water supply facilities. . In other words, using the water supplied from the fire hydrant, the victim is supplied with drinking water and domestic water instead. Specifically, a conduit of an appliance (water faucet) equipped with a temporary faucet is connected to the drain of the fire hydrant and assembled, and water is supplied from the attached faucet. By the way, such a fire hydrant has been conventionally provided in a state protruding from the road surface. However, the fire hydrant that protrudes from the ground in this way obstructs the path for passers-by and traveling vehicles even when not in use. Therefore, recently, measures have been taken so that fire hydrants are buried in manholes (underground), etc., so that they do not hinder when not in use. However, if the fire hydrant is still buried underground, the assembly work becomes difficult. In other words, in situations where there is a shortage of personnel, such as in an emergency, there may be a situation where an amateur such as a disaster victim must perform the above-described device assembly work. It is very difficult for those who are not accustomed to such work to perform the above assembling work.

  In view of the above problems, for example, a fire hydrant described in Patent Document 1 described below has been proposed. According to this disclosure, when a fire hydrant is buried underground and water supply is enabled (opened) by a valve opening / closing operation unit, it receives water pressure from a water pipe (water pipe buried underground) and receives an upper pipe (water supply faucet). The part which comprises) rises and protrudes to a predetermined ground position. In addition, after use, when the water supply is disabled by the valve opening / closing operation unit (valve closing), the upper pipe is lowered and pulled back to the underground position again. As a result, when the fire hydrant is not used, the fire hydrant can be sunk in the basement where it does not become an obstacle for a vehicle traveling on the road surface, and when used, it can be projected to a ground position where the appliance can be easily connected. .

JP-A-7-113254

  In the above conventional technology, when using a water hydrant (fire hydrant) buried underground, the water hydrant is automatically and continuously determined by performing a certain operation (valve opening / closing of the valve opening / closing operation part). It was possible to project to the ground position. That is, the part that rises by this operation (upper pipe) is a mechanism that rises to a predetermined position only by the water pressure of the underground water, so once the opening operation is performed, it reaches to the predetermined position regardless of the manual operation. It rose continuously. Therefore, for example, if there is a child or the like near the water faucet and the opening operation is inadvertent, there is a risk of unexpected damage unless the rise is stopped instantaneously.

  Moreover, such a faucet has an opportunity mainly to be used only at the time of a disaster, and in such an emergency situation, a person familiar with the operation does not always perform the operation. Therefore, for those who are not accustomed to the operation, it is difficult to sense how fast the hydrant is raised and to what extent, so this not only gives anxiety to the operation but also makes it unexpected for the operator himself. It could have been damaged.

  Further, the ascending mechanism in detail is configured to automatically move up and down by a sliding mechanism between pipes, a buffering mechanism that squeezes and buffers the water flow, and a complicated mechanism that incorporates each stopper and the like. Therefore, in the unlikely event that a failure that prevents this sliding occurs, the elevator does not move up and down normally, and there is a possibility that a sudden lifting operation is caused by water pressure thereafter. Therefore, for use over a long period of time, the reliability of smooth operation due to deterioration of each component or the like is low and unstable.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is to provide a water hydrant (fire hydrant) that can appear and disappear from the ground when necessary, An object is to ensure that the lifting operation can be performed reliably and stably.

In order to solve the above problems, the retractable water supply apparatus of the present invention takes the following means.
First, the first invention of the present invention is a retractable water supply device that is arranged to be extendable and retractable by a double pipe so that a water faucet can appear and disappear on the ground in a water pipe buried underground. Between the heavy pipes, there is provided resistance means to which a resistance that does not expand due to water pressure from the water pipe is provided.
According to the first aspect of the present invention, the double pipe connected to the water supply pipe buried underground is configured such that one pipe can be expanded and contracted with respect to the other pipe, so that it can appear and disappear on the ground. It is arranged. Any one of these pipes is biased in the extending direction by the water pressure from the water pipe. However, this energized tube is not stretched by water pressure because it receives resistance by the resistance means. The tube in a stationary state can be extended by applying a force in a predetermined extension direction by manual operation or the like.

Next, according to a second aspect of the present invention, in the first aspect described above, the resistance of the resistance means is provided by a sliding frictional force between the double pipes.
According to the second invention, the resistance by the resistance means is caused by the sliding frictional force accompanying the expansion and contraction of the double pipe. That is, when any pipe is urged in the extending direction by water pressure, a sliding frictional force acts between the double pipes. Therefore, the action of this sliding frictional force resists water pressure, so that it does not extend the tube.

Next, according to a third aspect of the present invention, in the first or second aspect described above, the resistance means includes a guide portion spirally formed in one of the double tubes, and the guide portion. A resistance is provided by an engagement pin provided on the other pipe to be joined.
Here, the spirally formed guide part is formed in a concave line so that the engagement pin is loosely fitted, or formed in a convex line so that the engagement pin comes into contact from below. Included.
According to the third invention, the expansion and contraction of the double pipe is caused to slide in contact with the helical guide portion formed on one pipe engaged with the engagement pin provided on the other pipe. Is done. Accordingly, the force that the tube is urged in the extension direction by the water pressure is decomposed into a force in the direction of extending the tube in the longitudinal direction and a force in the direction of rotating the tube by the lead angle of the spiral. That is, when the tube is extended, a sliding frictional force acts, and the force for extending the tube in the longitudinal direction is reduced. Therefore, both of these actions work so as not to stretch the tube. Further, if the tube is rotated in the spiral direction when necessary, the tube in a stationary state can smoothly expand and contract.

Next, according to a fourth aspect of the present invention, in the first aspect described above, the resistance of the resistance means is formed by engaging a guide portion formed in a horizontal direction on one tube of the double tube and the guide portion. It is given by the engaging pin provided in the other pipe.
Here, the guide portion formed in the horizontal direction is formed in a concave stripe so that the engagement pin is loosely fitted, or is formed in a convex stripe so that the engagement pin comes into contact from below. Included.
According to the fourth aspect of the present invention, the force in the direction of extending the pipe caused by the water pressure in the longitudinal direction is applied to the guide portion formed in the horizontal direction on one pipe and the engaging pin provided on the other pipe. By being combined, it is in an equilibrium state. Thus, the tube does not stretch due to water pressure.

Next, according to a fifth aspect of the present invention, in the fourth aspect described above, the guide portion is formed so as to guide the engagement pin in a spiral manner to one of the double tubes, and is partially Are formed in the horizontal direction.
According to the fifth aspect of the invention, the guide portion for imparting resistance so that the tube does not extend is formed so as to guide the engagement pin in a spiral shape, and partially formed in the horizontal direction. It has become. Therefore, the horizontal portion of the guide portion acts so as not to extend the tube, and this portion is partially formed in a spiral shape (connected from the helix), so that it does not become a stepped portion, and when necessary, the tube If the tube is rotated in the spiral direction, the tube in a stationary state will expand and contract smoothly.

Next, according to a sixth aspect of the present invention, in any one of the third to fifth aspects described above, the engaging pin formed on one of the double tubes is provided with a rotating body. Is.
According to the sixth aspect, the sliding frictional force applied by the guide portion and the engagement pin is reduced. Therefore, when the stationary tube is extended, the behavior becomes smooth.

Next, according to a seventh aspect of the present invention, in any one of the third to sixth aspects described above, the engagement pin and two or more guide portions that engage with the engagement pin are provided. It is.
According to the seventh aspect of the present invention, since two or more engaging pins and two guide portions that engage with the engaging pins are provided, it is possible to more stably impart resistance to the tube. Further, when the stationary tube is extended, the behavior becomes smooth.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, the double pipe that is energized in the extension direction by the water pressure from the water supply pipe is subjected to resistance, so that it does not expand due to the water pressure and becomes stationary. That is, when a force is applied in a predetermined extension direction by manual operation when necessary, the double pipe can be reliably extended by a required amount. Specifically, when the extension operation is stopped halfway, the double pipe is brought into a state where it receives only the water pressure again and stops. Therefore, there is no fear that the double pipe will be excessively stretched more than necessary, and there is no fear of suddenly moving up and down from a stationary state as before (safe), and its behavior is stabilized. Can be made.

Next, according to the second aspect of the present invention, resistance that does not expand due to water pressure can be imparted by the sliding frictional force between the double pipes. Therefore, resistance can be imparted to the double pipe with a relatively simple configuration.
Next, according to the third aspect of the present invention, extension of the tube can be gently stopped by the guide portion formed in a spiral shape. Moreover, if the tube in a stationary state is rotated in the spiral direction, it can be smoothly extended with a light force.
Next, according to the fourth aspect of the present invention, the extension of the tube can be more reliably stopped by the guide portion formed in the horizontal direction.
Next, according to the fifth aspect of the present invention, the guide portion that acts so as not to extend the tube is not stepped, and when the stationary tube is extended when necessary, the spiral is lightened by a force. And can be stretched smoothly. Similarly, it is possible to smoothly reach the portion where the tube is stationary.
Next, according to the sixth aspect of the present invention, the sliding friction force when the double pipe is extended can be reduced, so that the extension operation can be performed more smoothly.
Next, according to the seventh aspect of the present invention, it is possible to more stably impart resistance to the tube. In addition, it is possible to perform a smooth extension operation while suppressing backlash when the double pipe is extended.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the retractable water supply apparatus 10 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of an appearance of the arrangement of the retractable water supply apparatus 10, FIG. 2 is a side view of the retractable water supply apparatus 10, FIG. 3 is a plan view of the retractable water supply apparatus 10, and FIG. FIG. 5 is a cross-sectional view in which 20 is partially enlarged, and FIG. 5 is a diagram illustrating a usage state of the retractable water supply apparatus 10. The retractable water supply device 10 of the present embodiment is arranged in a connected state to a water supply pipe P buried underground, and is configured to allow the water faucet 30 to appear and disappear with respect to the ground when necessary. Specifically, the retractable water supply device 10 is configured to be given resistance so as not to increase depending on the water pressure received from the water pipe P, and can be increased by a desired amount by manual operation when necessary.

  Next, the configuration of the retractable water supply apparatus 10 will be described. As shown in FIGS. 1 to 4, the retractable water supply apparatus 10 includes a double pipe 20 that can be expanded and contracted, a water tap 30 that is connected to the upper part of the double pipe 20, and a water pipe that is buried underground. A flange 40 for connecting the connection port 21a of the double pipe 20 to the pipe P, and a resistance means 50 for applying resistance to the double pipe 20 to be extended by water pressure from the water pipe P. .

Specifically, the double pipe 20 includes a main pipe 21 having a connection port 21a at one end, and a sliding pipe 22 loosely fitted to the main pipe 21. An O-ring 23 is provided.
In addition, on the outer peripheral wall surface 21b of the main pipe 21, spiral guide grooves 52 extending from a predetermined lower position to an upper position are formed at positions (two places) facing each other. Specifically, the spiral guide groove 52 has a lead angle of 50 degrees and is formed to make one and a half revolutions of the outer periphery of the main pipe 21. Note that this lead angle is merely an example set to provide resistance that the double pipe 20 does not expand due to water pressure.
The sliding tube 22 is provided with two plungers 53 that engage with the spiral guide groove 52. Specifically, a sphere 53a corresponding to the rotating body in the present invention is attached to the tip of the plunger 53 so that it slides smoothly in the spiral guide groove 52. Further, the sliding tube 22 is arranged in a state where it overlaps with the main tube 21 (the plunger 53 is positioned at the lower end of the spiral guide groove 52) in a normal state. When the plunger 53 in the combined state slides along this spiral, the sliding tube 22 is extended with respect to the main tube 21. Here, the spiral guide groove 52 corresponds to the guide portion of the present invention, and the plunger 53 corresponds to the engagement pin of the present invention.

Next, as shown well in FIGS. 2 and 3, the water tap 30 is connected to the cheese 31 (the cheese 31 is connected via the socket 33 and the nipple 34) to the upper end of the sliding tube 22. Are attached to both attachment ports 31 a (attached via bushings 32), and these are extended and contracted integrally with the sliding tube 22. In addition, a handle 60 for manually operating the water tap 30 is provided on the top of the cheese 31.
Next, the flange 40 is fixed to the flange of the water supply pipe P buried in the ground by bolts or the like, and the connection port 21a of the main pipe 21 is connected to the water supply pipe P in communication.

  Next, the resistance means 50 gives resistance to the double pipe 20 which is going to extend by the water pressure from the connected water supply pipe P. Specifically, as shown well in FIG. The above-described spiral guide groove 52 and the plunger 53 provided with a sphere 53a are included. Specifically, when the double pipe 20 is extended, the resistance means 50 applies a sliding friction resistance force by the plunger 53 and the spiral guide groove 52, and further, the spiral guide groove constituting the spiral. The force for extending the sliding tube 22 is decomposed and reduced by the inclined surface 52. Thereby, the resistance which the double pipe 20 does not expand | extend with water pressure is provided. The latter resistance will be described in detail. When the double pipe 20 receives water pressure from the water pipe P, the plunger 53 is urged in the extending direction of the double pipe 20 to press the upper surface of the spiral guide groove 52. As a result, the force for extending the double tube 20 by water pressure is decomposed into a force in a direction for extending the sliding tube 22 and a force in a direction for rotating the sliding tube 22. Accordingly, the force for extending the sliding tube 22 is substantially reduced. Therefore, the action of both acts so as not to extend the double pipe 20 by water pressure.

  As described above, the retractable water supply apparatus 10 of the present embodiment is configured. Then, the usage method of the retractable water supply apparatus 10 is demonstrated based on the usage example which makes the water tap 30 arrange | positioned in the connection state to the piping P for waterworks embed | buried underground to a predetermined | prescribed ground position. . Here, as shown in FIG. 1, in the retractable water supply device 10 disposed underground (in the manhole M dug in the ground G), the flow with the water supply pipe P is blocked by the on-off valve V. Has been. Therefore, the retractable water supply apparatus 10 in this state does not receive the water pressure from the water supply pipe P.

First, the cover C of the manhole M shown in FIG. 1 is removed, and the on-off valve V is opened. Thereby, the retractable water supply apparatus 10 is in a circulation state with the water pipe P and receives water pressure. However, the double pipe 20 subjected to the water pressure is given resistance by the resistance means 50 and does not rise.
Therefore, next, as shown in FIG. 5, the handle 60 is held and the water tap 30 is raised. Specifically, the handle 60 may be gripped and a light tensile force may be applied in the spiral direction. Thereby, the water tap 30 in a stationary state (including a portion integrated with the water tap 30) can be raised by a desired amount. If the raising operation of the water tap 30 is stopped halfway, the water tap 30 is again stopped by the resistance means 50. Thus, the faucet 30 can be safely raised to a predetermined ground position by a simple manual operation. Here, after raising the faucet 30 to a predetermined ground position (the ground position in FIG. 5 in this embodiment), for example, the water outlet 30a is rotated upward to make it easy to use. do it.

  After use of the water tap 30, the on-off valve V is closed to release the water pressure inside the retractable water supply device 10 from the water outlet 30 a of the water tap 30. To the initial position (in the manhole M).

As described above, the retractable water supply apparatus 10 according to the present embodiment can impart resistance that does not increase depending on the water pressure to the double pipe 20 that is to be expanded by receiving water pressure from the water pipe P. Further, the resistance means 50 for imparting such resistance reduces the sliding friction resistance force caused by sliding the plunger 53 in the spiral guide groove 52 and the force (due to water pressure) for extending the double pipe 20. And letting both act. Thereby, a substantially equivalent resistance force is applied to the water pressure so that the double pipe 20 is not expanded. Therefore, when raising the water faucet 30 to a predetermined position on the ground, it is safe without suddenly vigorously rising due to water pressure.
Further, when necessary, if a light force (light tensile force) is applied to the stationary water faucet 30 by manual operation or the like, it can be easily lifted (drawn) by a desired amount, which is very convenient. is there.
Furthermore, since the spiral guide portion and the plunger 53 are provided at positions facing each other (two or more are provided), it is possible to stably impart resistance to the double tube 20. In addition, when manual operation is performed, rattling or the like during expansion is unlikely to occur, and the operation can be performed smoothly. In addition, since the sliding frictional resistance with the spiral guide groove 52 is reduced by the sphere 53a attached to the tip of the plunger 53, a smooth extension operation is also possible with this.
Furthermore, it is possible to achieve the safe, reliable and stable raising of the faucet 30 as described above by the simple configuration described above. That is, since the number of parts of the mechanism relating to the application of resistance is small, the manufacturing cost can be reduced. Further, since it has a simple configuration, it is less likely to cause a failure and can be used for a long time.

  Next, the retractable water supply apparatus 11 according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is an external front view of the arrangement state of the retractable water supply device 11, and FIG. 7 is a partially enlarged cross-sectional view of the double pipe in FIG. In addition, in a present Example, description about the location which show | plays the structure and effect | action similar to the retractable water supply apparatus 10 of Example 1 is abbreviate | omitted, and will explain in detail about a different location.

  As shown in FIGS. 6 and 7, the retractable water supply apparatus 11 is formed with a horizontal guide groove 54 and a spiral guide groove 55 connected to the horizontal guide groove 54 on the outer peripheral wall surface 21 b of the main pipe 21. Yes. The spiral guide groove 55 has a lead angle that is larger than that of the spiral guide groove 52 in the first embodiment, and is connected to the horizontal guide groove 54 at a predetermined position, and as a whole, rotates the outer periphery of the main pipe 21 one and a half times. It is formed like this. Therefore, when the sliding tube 22 is raised, the plunger 53 engaged with the spiral guide groove 55 slides along the spiral guide groove 55 and the horizontal guide groove 54, and the slide tube 22 is moved to the main tube 21. Stretch against. Here, the horizontal guide groove 54 corresponds to the guide portion of the present invention.

  Next, the resistance means 51 includes the horizontal guide groove 54 described above and a plunger 53 having a sphere 53a. In the present embodiment, the resistance means 51 brings the force to extend the double pipe 20 into an equilibrium state (resistance) by bringing the plunger 53 under water pressure into contact with the horizontal guide groove 54. Is granted). That is, when water pressure is received, the plunger 53 is urged in the extending direction of the double pipe 20 and presses the upper surface of the horizontal guide groove 54. This action works so as not to extend the double pipe 20 by water pressure. Further, since the spiral guide groove 55 has a lead angle larger than that of the first embodiment, the spiral guide groove 55 imparts a certain resistance to the ascent of the slide tube 22 (sliding of the plunger 53). Therefore, the sliding tube 22 behaves gently while sliding along the spiral guide groove 55.

As described above, the retractable water supply apparatus 11 of this embodiment is configured. Then, the usage method of the retractable water supply apparatus 11 is demonstrated based on the usage example which makes the water tap 30 arrange | positioned in the connection state to the piping P for waterworks embed | buried underground to a predetermined | prescribed ground position. .
The sliding tube 22 (plunger 53) that has received water pressure by the opening operation of the on-off valve V gently slides in the spiral guide groove 55 and reaches the horizontal guide groove 54. Thereby, since resistance is provided by the resistance means 51, the double pipe 20 does not rise.
Therefore, if the person who performs the work grasps the handle 60 and performs manual operation (lifting operation), the stationary water faucet 30 (including a portion integrated with the water faucet 30) is placed at a predetermined position (next horizontal guide groove). 54) It can be raised to a desired position while having the function of being stopped.

As described above, the retractable water supply apparatus 11 of the present embodiment makes the behavior of the double pipe 20 subjected to water pressure moderate by applying a certain resistance by the spiral guide groove 55, and further, the horizontal guide In the groove 54, it is possible to reliably prevent the double pipe 20 from being extended by water pressure.
Further, when the stationary double tube 20 is extended when necessary, it can be easily and smoothly extended only by applying a light tensile force in the spiral direction. That is, the water faucet 30 can be lifted and lowered safely, reliably and stably.

Although the embodiment of the present invention has been described with reference to two examples, the present invention can be implemented in various forms in addition to the above-described example.
For example, the double pipe 20 may be formed long. That is, if the length of the double pipe 20 that can be extended is formed in a long length in accordance with a desired height position at which the water tap 30 is desired to protrude from the ground, the length is adjusted to the depth in which the water pipe P is buried. It can be applied to various usage forms such as.
Moreover, the magnitude | size of the resistance which the faucet 30 does not raise by water pressure (the double pipe 20 does not expand | extend) is integrated with the water pressure from the piping P for water supply, and the retractable water supply apparatuses 10 and 11 (sliding pipe 22). Depending on the weight of the entire sliding part). Therefore, for example, when the water pressure is high, the magnitude of the resistance may be changed by reducing the lead angle of the spiral guide grooves 52 and 55.
Further, although two resistance means 50 and 51 are provided to provide resistance and stabilize the operation, one or three or more resistance means 50 and 51 may be provided.
Furthermore, although the spiral guide grooves 52 and 55 and the horizontal guide groove 54 are shown, they may be formed on convex ridges. That is, when the sliding tube 22 is raised by water pressure, the plunger 53 presses from below the ridge, so that the same action and effect can be obtained.
Furthermore, the formation position and number of the horizontal guide grooves 54 shown in the second embodiment are not limited. For example, the formation position is provided so that the water faucet 30 stops at a position where the water tap 30 reaches the ground G. If this is the case, it is possible to reliably prevent a situation in which the water tap 30 suddenly protrudes from the ground G, which is preferable.

It is an external appearance front view of the arrangement | positioning state of the immersion type water supply apparatus in Example 1. FIG. It is a side view of the retractable water supply apparatus in Example 1. It is a top view of the sinking type water supply apparatus in Example 1. FIG. It is sectional drawing which expanded the double pipe in FIG. 1 partially. It is a figure which shows the use condition of the immersion type water supply apparatus in Example 1. FIG. It is an external appearance front view of the arrangement | positioning state of the immersion type water supply apparatus in Example 2. FIG. It is sectional drawing to which the double pipe in FIG. 6 was expanded partially.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,11 Intrusion type water supply apparatus 20 Double pipe 21 Main pipe 21a Connection port 21b Outer peripheral wall surface 22 Sliding pipe 23 O-ring 30 Water faucet 30a Water discharge port 31 Cheese 31a Mounting port 32 Bushing 33 Socket 34 Nipple 40 Flange 50, 51 Resistance means 52 Spiral guide groove (guide section)
53 Plunger (engagement pin)
53a Sphere (Rotating body)
54 Horizontal guide groove (guide section)
55 Spiral guide groove 60 Handle P Water supply pipe V On-off valve G Ground M Manhole C Lid

Claims (7)

An in / out type water supply device that is arranged to be extendable / contracted by a double pipe so that a water faucet can be made to appear / invade on the ground in a water pipe buried underground,
A retractable water supply apparatus is provided between the double pipes, wherein resistance means to which resistance that does not expand due to water pressure from the water pipe is provided is provided. A retractable water supply device according to claim 1,
The resistance of the resistance means is given by the sliding frictional force between the double pipes. A retractable water supply device according to claim 1 or 2,
The resistance means is configured to provide resistance by a guide portion spirally formed in one of the double tubes and an engagement pin provided in the other tube engaged with the guide portion. An intruding water supply device characterized by A retractable water supply device according to claim 1,
The resistance of the resistance means is provided by a guide portion formed in a horizontal direction in one of the double tubes and an engagement pin provided in the other tube engaged with the guide portion. A haunting water supply system. A retractable water supply device according to claim 4,
The guide part is formed so as to guide the engagement pin in a spiral manner in one of the double pipes, and is partially formed in a horizontal direction. . A retractable water supply device according to any one of claims 3 to 5,
A retractable water supply apparatus, wherein a rotating body is provided on an engagement pin formed on one of the double pipes. A retractable water supply device according to any one of claims 3 to 6,
A retractable water supply apparatus, wherein the engaging pin and two or more guide portions engaging with the engaging pin are provided.

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